Render & Composition
As mentioned earlier the hair and the bust were done separately, and the renders were different from each other. For the bust render I used mental ray because it's better for skin materials and indirect illumination, and for the hair I used Scanline because it works better with hair (Fig.17).

Fig. 17
The passes were composed in Photoshop, and there I made lots of color adjustments and used some brushes to correct the shadows (Fig.18).

Fig. 18
For the background I wasn't really sure what I wanted to do. In the beginning, the idea was a flat background like in a photography studio. But during the process I changed my mind to use a photo of an internal room, like the reflection that I used. In the end, when I already had the passes I was composing, I realized that using a red flat background would be better. It's good because the red color complements the green of his sweater and eyes.
To help merge the render with the new background, I used the Blending Effect > Inner Glow option with red color on the character layer.
And here is the final image (Fig.19).

Fig. 19
I hope you enjoyed this Making Of. Thanks to 3DTotal for this opportunity and everyone who helped me with this character. Thank you for reading!